Muchos thanks to you both Rog and dejay!
I presume the latching switches will cancel if you switch off the electric's/engine ie. self cancelling if power is lost?
I'll start sorting all the parts and getting ready to swap out the PCB. I so want the car to get me into old age and cause me as little trouble as possible and when my son finally get the keys I don't want his learning curve to ruin his ownership pleasure!